I'm a bit confused. I was thinking of using my personal laptop (Lenovo Flex 14) as an Ubuntu 18.04 system. I thought I had cleared all of the hurdles/concerns I had, but I was reading that you need additional plugins/extensions to cast from Chrome. I found many complaints that it didn't work natively. After install, and the install of Chrome, it seems to work fine. I was able to cast from YouTube using Chrome to my Chromecast Ultra. So, what gives? Was this an issue that was recently rectified? Seems to work fine for me without any additional steps.